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Triple-layer perpendicular recording media for high SN ratio and signal stability

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2 Author(s)
Ando, T. ; Central R&D Center, Victor Co. of Japan Ltd., Yokohama, Japan ; Nishihara, T.

Media noise, SN ratio, and signal stability of triple-layer (TL) perpendicular recording media are studied. The TL medium is composed of a CoCrTa perpendicular layer, an amorphous CoZrNb soft magnetic layer, and a CoSm in-plane hard magnetic pinning layer. A high SN ratio is obtained due to the pinning effect of the CoSm layer and with an optimum CoCrTa perpendicular layer of a 50-nm-thick Co-Cr20-Ta3.5at% (Ms=400 emu/cm3) film. High signal stability against stray magnetic fields is obtained in TL media with a 600-nm-thick CoZrNb layer. Moreover, no thermal magnetic relaxations occurs in TL media at 60°C for 5 hours and at room temperature for 15 hours. The TL media are promising as practical ultrahigh-density recording media having high read-write reliability

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Magnetics, IEEE Transactions on  (Volume:33 ,  Issue: 5 )